/*
 * Copyright (C) 2007 Luca Veltri - University of Parma - Italy
 *
 * This file is part of MjSip (http://www.mjsip.org)
 *
 * MjSip is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * MjSip is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with MjSip; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *
 * Author(s):
 * Luca Veltri (luca.veltri@unipr.it)
 */

package org.zoolu.net;



import java.io.*;
import java.net.Socket;
import java.security.KeyStore;
import java.security.cert.X509Certificate;
import javax.net.ssl.*;



/** TLS socket factory.
 */
public class TlsSocketFactory
{

    /** SSLSocketFactory */
    SSLSocketFactory ssl_factory;

    /** Whether using client mode in first TLS handshake */
    boolean client_mode=true;

    /* Supported protocol versions */
    String[] supported_protocols=null;

    /* Enabled protocol versions */
    String[] enabled_protocols=null;



    /** Creates a new TlsSocketFactory */
    public TlsSocketFactory(TlsContext tls_context) throws java.security.KeyStoreException, java.security.KeyManagementException, java.security.UnrecoverableKeyException, java.security.NoSuchAlgorithmException
    {  KeyStore ks=tls_context.getKeyStore();
        // get key managers
        KeyManagerFactory key_manager_factory=KeyManagerFactory.getInstance(KeyManagerFactory.getDefaultAlgorithm());
        key_manager_factory.init(ks,TlsContext.DEFAULT_PASSWORD);
        KeyManager[] key_managers=key_manager_factory.getKeyManagers();
        TrustManager[] trust_managers;
        // get trust managers
        if (tls_context.isTrustAll())
        {  X509TrustManager trust_all=new X509TrustManager()
        {  public X509Certificate[] getAcceptedIssuers() {  return new X509Certificate[0];  }
            public void checkClientTrusted(X509Certificate[] certs, String auth_type) {}
            public void checkServerTrusted(X509Certificate[] certs, String auth_type) {}
        };
            trust_managers=new TrustManager[] { trust_all };
        }
        else
        {  TrustManagerFactory trust_manager_factory=TrustManagerFactory.getInstance(TrustManagerFactory.getDefaultAlgorithm());
            trust_manager_factory.init(ks);
            trust_managers=trust_manager_factory.getTrustManagers();
        }
        // install only the trust managers
        SSLContext sc=SSLContext.getInstance("SSL");
        sc.init(key_managers,trust_managers,null/*new java.security.SecureRandom()*/);
        // get the socket factory
        ssl_factory=sc.getSocketFactory();
    }


    /** Sets whether using client (or server) mode in its first handshake.
     * Servers normally authenticate themselves, and clients are not required to do so. */
    public void setUseClientMode(boolean flag)
    {  client_mode=flag;
    }


    /** Whether using client (or server) mode in its first handshake.
     * Servers normally authenticate themselves, and clients are not required to do so. */
    public boolean getUseClientMode()
    {  return client_mode;
    }


    /** Gets the list of supported protocol versions. */
    public String[] getSupportedProtocols()
    {  if (supported_protocols==null) initSupportedProtocols();
        return supported_protocols;
    }


    /** Gets the list of enabled protocol versions. */
    public String[] getEnabledProtocols()
    {  if (enabled_protocols==null) initSupportedProtocols();
        return enabled_protocols;
    }


    /** Sets the list of enabled protocol versions. */
    public void setEnabledProtocols(String[] enabled_protocols)
    {  this.enabled_protocols=enabled_protocols;
    }


    /** Inits supported and enabled protocol versions. */
    private void initSupportedProtocols()
    {  try
    {  SSLSocket ssl_socket=(SSLSocket)ssl_factory.createSocket();
        if (supported_protocols==null) supported_protocols=ssl_socket.getSupportedProtocols();
        if (enabled_protocols==null) enabled_protocols=ssl_socket.getEnabledProtocols();
        ssl_socket.close();
    }
    catch (Exception e) {  e.printStackTrace();  }
    }


    /** Creates a new TlsSocket */
    public TlsSocket createTlsSocket(String host, int port) throws IOException
    {  //SSLSocket ssl_socket=(SSLSocket)ssl_factory.createSocket(host,port);
        //return new TlsSocket(ssl_socket);
        SSLSocket ssl_socket=(SSLSocket)ssl_factory.createSocket();
        if (!client_mode) ssl_socket.setUseClientMode(false);
        if (enabled_protocols!=null) ssl_socket.setEnabledProtocols(enabled_protocols);
        ssl_socket.connect(new java.net.InetSocketAddress(host,port));
        return new TlsSocket(ssl_socket);
    }


    /** Creates a new TlsSocket */
    public TlsSocket createTlsSocket(IpAddress ipaddr, int port) throws IOException
    {  //SSLSocket ssl_socket=(SSLSocket)ssl_factory.createSocket(ipaddr.getInetAddress(),port);
        //return new TlsSocket(ssl_socket);
        SSLSocket ssl_socket=(SSLSocket)ssl_factory.createSocket();
        if (!client_mode) ssl_socket.setUseClientMode(false);
        if (enabled_protocols!=null) ssl_socket.setEnabledProtocols(enabled_protocols);
        ssl_socket.connect(new java.net.InetSocketAddress(ipaddr.getInetAddress(),port));
        return new TlsSocket(ssl_socket);
    }

}
